Athlete A runs 400m while Athlete B completes as many rounds of 5 pull-ups, 10 push-ups, 15 squats as possible. Immediately upon Athlete A's return from the run, Athlete B heads out, and Athlete A picks up at the exact point Athlete B left off, e.g., if Athlete B has completed 7 push-ups in his fourth round, Athlete A starts with push-up 8, then moves on to squats, etc.

LIII and II: as rx'd. Bodyweight triplet should take about 40s...scale volume and difficulty of movements as necessary.